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Chapter 27: Q7P (page 767)

Why would a reprecipitation be employed in a gravimetric analysis?

Short Answer

Expert verified

The reprecipitation method in the gravimetric analysis is used for reducing the level of impurities.

Step by step solution

01

Precipitation:

Precipitation gravimetry is an analytical technique that uses a precipitation reaction to separate ions from a solution. The chemical that is added to cause the precipitation is called the precipitant or precipitating agent.

During first precipitation, impurities are present in high concentrations and also are unwanted species.

02

Reprecipitation:

After returning a precipitate to a dissolved state, the process of precipitating it again.

During reprecipitation, precipitate is purer due to reduced level of impurities in a solution.

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Most popular questions from this chapter

A mixture containing only ${Al}_{2} O_{3}$ (FM 101.96) and ${Fe}_{2} O_{3}$ (FM 159.69) weighs 2.019 g. When heated under a stream of $H_{2} {Al}_{2} O_{3}$ is unchanged, butis ${Fe}_{2} O_{3}$ converted into metallic Fe plus $H_{2} O (g)$ If the residue weighs 1.774 g, what is the weight percent of ${Fe}_{2} O_{3}$ in the original mixture?

Why is high relative supersaturation undesirable in a gravimetric precipitation?

What measures can be taken to decrease the relative supersaturation during a precipitation?

Thermogravimetric analysis and propagation of error. 16 Crystals of deuteratedpotassium dihydrogen phosphate, $K {(D_{x} H_{1 - x})}_{2} {PO}_{4}$ are used in optics as a light valve, as a light deflector, and for frequency doubling of lasers. The optical properties are sensitive to the fraction of deuterium in the material. A publication states that deuterium content can be determined by measuring the mass lost by dehydration of the crystal after slow heating to $450 ° C$ in a Pt crucible under $N_{2}$

(a) Let $α$ be the mass of product divided by the mass of reactant:

$α = \frac{mass of {KPO}_{3}}{mass of K {(D_{x} H_{1 - x})}_{2} {PO}_{4}}$

Show that the coefficient xin $K {(D_{x} H_{1 - x})}_{2} {PO}_{4}$ is related to $α$ by the equation

$x = \frac{58.6670}{α} - 67.6183$

What would be the value of $α$ if starting material were 100% deuterated?

(b) One crystal measured in triplicate gave an average value of $α = 0 . 8567_{7}$ .Find x for this crystal.

(c) From equation B.1 in Appendix B, show that the uncertainty in $x (e_{x})$ is related to the uncertainty in $α (e_{α})$ by the equation

$e_{x} = \frac{58.6670 e_{α}}{α^{2}}$

(d) The uncertainty in deuterium: hydrogen stoichiometry is $e_{x}$ The authors estimate that their uncertainty in $α$ is $e_{x} = 0.0001 .$ From $e_{α}$ compute $e_{x}$ . Write the stoichiometry in the form $x \pm e_{x}$ If $e_{x}$ were 0.001 (which is perfectly reasonable), what would $e_{x}$ be?

If reproducibility is $\pm 0.5 mg$ , product mass might have been0.1339to 0.1349 g. Find wt\% $Al (C_{9} H_{6} NO)_{3}$ if the product weighed 0.1339 g.

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